As long as I can remember, I've had leg pains in the exact same spot, being my inner calf. As I've grown up though, it seems that it changes a bit. Its always the same spot, but it now start in one leg (typically my ankle), moves up it, then switches to the other side, down that side, to that ankle. It can stop after just once, or continue for an hour or so.
This has been happening as long as I can remember, and just seems random. Some times it'll happen three times a week, sometimes three times a month.
Also, my knee's sometimes have the same sort of aching pain, but its not as constantly connected with my leg pains. Sometimes my knee's just hurt by themselves, while other times they hurt with the rest of my legs, but I never see any swelling.
I hope this is enough information, just let me know if theres anything else I can provide to help. I've never been to a doctor about it.